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Equity and Stock-based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands	Dec. 31, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Common stock outstanding	82,498	63,665
Stock options outstanding	11,550	13,660
RSUs outstanding	1,562	1,211
Common stock warrants outstanding	4	4
Shares reserved for future stock options and RSUs grant	4,190	4,032
Total shares of common stock reserved	101,828	84,210
ESPP [Member]
Class Of Stock [Line Items]
Shares reserved for future ESPP offering	2,024	1,638

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Common stock shares reserved.

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Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
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Aggregate number of common shares reserved for future issuance.

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-Section S99
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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